London

says Francis Crossley, is Luan-dun (Celtic), City of
the Moon, and tradition says there was once a temple of Diana (the
Moon) where St. Paul's now stands. Greenwich he derives from Grian-wich (City of the Sun), also Celtic. It would fill a page to
gave a list of guesses made at the derivation of the word London. The
one given above is about the best for fable and mythology. (See Augusta, Babylon, and Luds Town.)